DE102014221353A1 - Welding jaws for a packaging machine - Google Patents

Abstract

A packaging assembly (10) includes a weighing machine (11) containing containers (12, 13) providing batches of a product to be fed to a format set (41), said format set (41) comprising tubular bag material having a product of a packaging machine (18 ) feeds. The tubular bag material is fed to the packaging machine (18) by means of a film transport arrangement (17).

Description

area

The present invention relates to packaging machines and more particularly to welding jaws for packaging machines.

background

Packaging machines receive bag material in tube form. Products to be packaged are introduced into the interior of the tubular bag material, and then the packaging machine seals or shreds the tubular tubing and transverses it to form bags with the product. The tubular bag material is molded by a forming shoulder which is fed to packaging film in strip form. Formatsätze and packaging machines are in the U.S. Patents 4,910,943 . 5622032 . 4663917 . 6655110 . 7159376 . 7600630 . 7383672 . 4753336 . 7124559 . 7415809 . 7152387 and 7472528 as well as the Australian Patent Applications 2012258403 . 20122584 . 2012258497 . 2012201494 and 2012201595 and 2011360138 , as well as in the international application PCT / EP2013 / 052754 disclosed.

The tubular material produced by the forming shoulder is welded longitudinally. This object is achieved by heating the tubular bag material along its longitudinally overlapping edges and applying pressure to the overlapping longitudinal edges.

Above the format set is a weighing machine that feeds batches of a product to a collar that extends to the format set, with an inner collar extending from the center opening of the format set to a position adjacent to or below the bottom edge of the format set.

The tubular bag material passes the format set having the forming shoulder, is longitudinally welded and then fed to the packaging machine. In this case, batches of a product are supplied to the interior of the tubular bag material from the weighing device, wherein the batches consist of product which is distributed over a length of the tubular bag material. A film transport arrangement is located below the format set and above the packaging machine. The film transport assembly engages the tubular bag material to cause the strip material to pass over the format set and feeds the tubular bag material to the packaging machine below. Typically, the film drive unit includes a pair of driven belts (or rollers) that drive the tubular bag material at a desired speed. The packaging machine includes at least one pair of rotationally driven beams, the jaws having a peripheral speed (when engaged with the tubular bag material) that corresponds to the speed of the tubular bag material determined by the film transport unit.

The disadvantage of the machines discussed above is that because of the length of each batch of product, the packaging machine is subject to restrictions on the number of bags it can produce per minute.

Product exiting the weighing machine is divided into batches. It is not uncommon for the batches to have a length of 100 ms when they leave the weighing machine. However, the batches go through a curved path as they enter the format set. This causes the product to contact itself and the inner surfaces of the tubular bag material. This increases the length of the product margins. For example, the length of a batch can increase to 600 ms. To ensure that the product is not between the sealing or welding jaws, programming the packaging machine assumes that the product margins are approximately 600 ms long.

The batches take elongated shape when the product falls over the format set in the packaging machine underneath. The longer the case length, the longer the batch will be.

The extended batches can cause another problem in that it becomes difficult to minimize the volume of a product in the bag being manufactured.

A disadvantage of known packaging machines is that the packaging machines can not operate at maximum speed due to unwanted increase in length of the batches.

task

The object of the present invention is to overcome or substantially remedy at least some of the disadvantages listed above.

Summary

Disclosed is a packaging machine that receives tubular bag material and product to make bags with the product, the material moves at a speed in a given direction relative to the machine, and the machine includes:
a pair of welding jaws, which are rotationally driven together by repeated revolutions in opposite angular directions, the jaws being driven about spaced, generally parallel axes generally transverse to the direction such that each jaw has an angular velocity about a corresponding one of the axes;
Jaw carriers to which the jaws are attached and by which they are driven; and
a control and motor assembly drivingly coupled to the carriers and therefore the jaws to effect rotation of the carriers, which arrangement is operable to change the angular velocity of the carriers so that the jaws when the jaws are adjacent to each other and engaging with the tubular bag material, have a peripheral speed in the direction that can be changed.

Preferably, the control and motor assembly may be operated to reverse the direction of rotation of the carriers and thus the welding jaws so that the welding jaws move in an opposite angular direction as they abut each other and engage the tubular bag material.

Disclosed is a combination of a film transport assembly and a packaging machine receiving tubular bag material from the film transport assembly;
the film transport assembly including a plurality of rollers, one of which is a drive disk, and an endless belt running around and driven by the rollers to form a belt drive section which is integral with the tubular bag material engages to move the tubular bag material in a predetermined direction for delivery to the packaging machine on the transport assembly, the packaging machine comprising:
a pair of welding jaws which are rotatably driven together by repeated revolutions in opposite angular directions, the jaws being driven about spaced, generally parallel axes which are generally transverse to the direction so that they each have an angular velocity and the welding jaws engaging the tubular bag material to transversely weld the tubular bag material and to produce bags having a product; and where
Motors are provided which are operatively connected to the film transport assembly and the packaging machine to effect operation of the belt and the welding jaws, and the combination further includes a controller operatively connected to the motors to function thereof; and the controller may be operated such that the motors drive the band and the jaws so that the jaws, when adjacent and engaged with the tubular bag material, have a peripheral speed that is lower than the speed of the band of the sheets -Transportanordnung.

Preferably, the motors include servomotors, wherein at least one servo motor drives the driven disk and at least one servomotor drives the welding jaws, and the controller is a computer programmed to operate the servomotors to cause the tape to give a predetermined amount to the tubular bag material Speed, and the servo motor driving the welding jaws is operated so that the welding jaws can have a peripheral speed lower than the predetermined speed.

Preferably, the peripheral speed may have a direction opposite to the predetermined direction.

Preferably, the band has a transport surface which frictionally engages the material, the band moving in a predetermined path including a generally linear first path portion at which the transport surface engages the material, and the band is a plurality of passageways extending from the surface across the belt;
a manifold, which is exposed to an air negative pressure and communicates with the passage over at least a portion of the path portion, so that the passages are subjected to negative air pressure and the material is exposed to the air by a difference in air pressure over the material at the first path portion Surface is pressed;
wherein the drive pulley is engaged with the band to cause the band to move in a predetermined direction on the path; and
a plurality of band engaging means, the band passing between a first one of the engagement means and a second one of the means to form the first path portion, the means and the disc cooperating to form a second path portion and a third path portion, and the second path portion and the third path section relative to the first Path portion in a direction away from the first path portion.

Preferably, the first and second rollers are tension rollers.

Preferably, the second and third sections are linear.

Preferably, the assembly includes a heating rail at the first path portion for heating the bag material.

Preferably, the band is a first band and the assembly includes a second band, the second band at the first path portion being generally parallel to the first band and including a transport surface and a plurality of passages extending transversely of the second band from the first band Extending transport surface of the second band out, and the passages of the second band are in communication with the manifold, so that the passages of the second band are also exposed to an air negative pressure to press the bag material into engagement with the second band.

Preferably, the second band runs around the second drive roller and a third and a fourth tension roller around.

Preferably, the second drive pulley has a radius and the third and the fourth tension roller each have a radius, wherein the radius of the second drive pulley is greater than the radius of the third and the fourth tension pulley.

Preferably, the first tension roller is located approximately vertically above the second tension roller.

Preferably, the second path portion extends between the second idler and the drive pulley, the second path portion extending generally horizontally.

Preferably, the transport assembly includes a further tensioning roller, the further tensioning roller or rollers pressing / pressing the belts into engagement with the drive disks.

Preferably, the die set includes a forming shoulder comprised of plate material defining a cavity and a bottom edge portion of the die set, the forming shoulder having an outer surface receiving strip-shaped bag material for forming the strip-like bag material into tubular bag material that is of the format set in a predetermined manner Direction is moved; and where
the rollers include an upper roller and a lower roller, the upper roller projecting at least partially higher than the lower edge section.

Preferably, the upper roller extends into the cavity.

Brief description of the drawings

Preferred forms of the present invention will now be described by way of example with reference to the accompanying drawings, in which:

1 a schematic side view of a packaging arrangement is;

2 a schematic side view of the transport arrangement of the packaging arrangement in 1 is;

3 a schematic side view of a modification of in 2 shown transport arrangement; and

4 is a schematic side view of a further modification of the transport arrangement in 2 and 3 ,

Description of embodiments

In the accompanying drawings is schematically a packaging arrangement 10 shown. The order 10 contains a weighing machine 11 holding a variety of containers 12 and 13 contains, to which a product is supplied from above, wherein the container 12 and 13 in function batches of the product of a chute 14 respectively. The chutes 14 The batches of the product carry a form shoulder 15 to. The form shoulder 15 has a format set 41 receiving strip-shaped bag material, and bringing the strip-shaped bag material into a tubular shape extending in the direction 16 emotional. The strip-shaped bag material comes with the outer surface format set 41 in contact and is thus brought into the tube shape. The tubular bag material moves through the upper opening 53 of the format set 41 downward. The direction 16 generally runs vertically down.

The tubular bag material 27 comes with a foil transport arrangement 17 engaged the strip material at the forming shoulder 41 along pulls and the tubular bag material 27 the packaging machine underneath 18 supplies.

The drive arrangement 17 contains a pair of sub-assemblies 19 , where the subassemblies 19 on opposite sides of the tubular bag material 27 and both with the tubular bag material 27 engage the tubular bag material 27 through the arrangement 10 to pull through.

Each subassembly 19 contains a band 20 that between a first tension roller 21 , a second tensioner 22 and a drive pulley 23 running. The section of tape 20 that is between the tension rollers 21 and 22 runs, forms a belt drive section 24 which is generally linear and parallel to the direction 16 is. The section 24 moves in the direction 16 , while moving the tubular bag material in the direction 16 ,

The ribbon 20 runs from the tension pulley 22 to the drive pulley (pulley) 23 and forms the second band section 25 , The band section 25 is generally horizontal, that is, generally perpendicular (transverse) to the direction 16 , The ribbon 20 runs around the disk 23 around to the tension pulley 21 and forms a band section 35 ,

The band section 24 follows a linear path generally parallel to the direction 16 and the direction in which the tubular bag material 27 extends. The band section 25 follows a generally linear path from the tubular bag material 27 (and section 24 ) runs away so that it moves in one direction from the sections 24 extends away. The band section 35 extends in one direction from the band portion 24 path.

The ribbon 20 runs in the direction 26 around the tension rollers 21 and 22 and drive pulley 23 around. The two band sections 24 generally extend in parallel in the same direction but are spaced transversely so as to be on opposite sides of the tubular bag material 27 are located.

The drive pulleys 23 be from a control-and-motor arrangement 44 so driven that they are the tubular bag material 27 give a desired velocity profile. The tubular bag material 27 becomes, as already mentioned, in the direction 16 driven. In a further preferred form, however, the control and motor arrangement 44 Speed in the direction 16 change and may preferably the movement of the tubular bag material 27 reverse so that the tubular bag material 27 is slowed down over one or more short periods, or even in a direction opposite to the direction 16 emotional. This movement causes the tubular bag material 27 is vibrated, which contributes to the fact that the product settles in the lower end of the bag that is produced. The control-and-engine arrangement 44 includes one / more computerized / computer controlled servomotor (s) 56 for every disc 23 ,

The partial arrangements described above 19 are particularly advantageous insofar as the tension rollers 21 and 22 have a smaller diameter than the drive pulley 23 , which in turn reduces the distance between the format set 15 and the packaging machine 18 can be reduced. This reduced length minimizes the length by which the product margins can be extended. This in turn allows the machine 18 be operated at a higher speed, which can produce a larger number of bags per minute.

The bands 20 The preferred embodiments described above have passages 40 on, across the band 20 pass through, with the passage 40 with a distributor 28 keep in touch. The distributors 28 is supplied to negative air pressure, so that a negative pressure on the passage 40 that works across the band 20 run through, and thus the tubular bag material 27 in contact with the first band sections 24 is pressed. That is, the distributors 28 stand at the first band section 24 in connection with the passage 40 , To sealingly secure the longitudinal edge portions of the bag material together (around the tubular bag material 27 manufacture), a (welding) heating rail, not shown, is present. Furthermore, a third tensioning roller is preferred 29 present, attached to a pivoting arm 30 is installed, so the role 29 in contact with the band 20 is pressed, which in turn causes the tape 20 in contact with the drive pulley 23 is pressed.

Preferably, the tension rollers 21 and 22 generally parallel axes of rotation, which are transverse to the direction 16 are while the tension rollers 21 and 22 Have axes that are generally parallel to the axes of rotation of the drive pulleys 23 are.

In the embodiment in FIG 1 and 2 stands the upper roll 21B at least partially above the lower edge portion 42 of format set 41 before and is at least partially in the cavity 52 , This has the particular advantage that the distance between the format set 41 and the packaging machine 18 is reduced and thus, as explained above, the extension of the batches is reduced to a minimum.

In the embodiment in FIG 3 and 4 are the upper rollers 21 larger and not above the lower edge section 42 in front. It should be understood, however, that in the embodiment in FIG 3 and 4 the upper rollers 21 could be smaller and could be moved upwards so that they are at least partially in the format set 41 formed cavity, that is, at least partially above the lower edge portion 42 protrude.

The packaging machine 18 contains a pair of rotatably driven welding jaws 31 , Each of the baking 31 on a jaw carrier (arm) 45 attached to a shaft 32 is attached, with the waves 32 in opposite angular directions 33 be driven rotating. Accordingly, the welding jaws 31 driven by repeated revolutions synchronously about generally parallel axes, the axes spaced and generally transverse to the direction 16 are. The welding jaws 31 come with the tubular bag material 27 engaged, weld the bag material 27 in the transverse direction and cut through the bag material 27 so that individual bags emerge.

The waves 32 Be by control-and-motor arrangement 44 driven, the arrangement 44 can be operated so that it causes the waves 32 and the carriers 45 a desired angular velocity profile (through the waves 32 determined). Preferably, the control and motor arrangement 44 be operated so that the jaws 31 when they abut each other and with the tubular bag material 27 engage, have a peripheral speed which is lower than the speed of the tubular bag material 27 on the tapes 20 in that direction 16 , In a further preferred form, the jaws 31 when using the tubular bag material 27 to be slowed down, or even reversed over one or more periods so that they are in a direction opposite to the direction of rotation 33 move. This function of the welding jaws 31 helps make the product settle at the bottom of the bag being made. By pushing the product towards the bottom of the bag being made, the possibility of the product being between the welding jaws is reduced 31 is included. This feature also helps to increase the speed of making bags. When the baking 31 with the bag material 27 be engaged to make a weld, have the jaws 31 the same speed as the bag material 27 between the cheeks 31 , Accordingly, the bag material changes 27 that deals with the baking 31 moves, its speed.

The control-and-engine arrangement 34 contains a computer and a servomotor for each shaft 32 , where the computer is programmed to use the servomotor 57 operates so that the desired speed profile is generated.

In the embodiment in FIG 4 contain the subassemblies 19 only the drive pulley 23 and one of the tension rollers (discs) 21 , The bands 20 run in the direction 26 around the discs 23 and the tension rollers 21 around. The drive pulleys 23 are, as already described, of the control-and-motor arrangement 44 so they operated the tapes 20 give a desired velocity profile. For example, the bands 20 as explained in the preceding embodiment, slowed down and / or reversed.

The control-and-engine arrangement 34 as well as the control-and-motor arrangement 34 can jointly use a computer that controls the function of the servomotors that drive the disks 23 and the waves 32 drive, so the speed of the welding jaws 31 with the tubular bag material 27 is coordinated. However, it should also be understood that the computer could control the servo motors so that the welding jaws, when they abut each other or with the tubular bag material 27 engage, have a peripheral speed that differs from the speed that the tubular bag material 27 through the band 20 is awarded. For example, the cheeks 31 and the tubing engaged therewith 27 have a lower speed through which the product settles at the bottom of the bag, with the speed of baking 31 is then increased if the cross-welding is to be made on the bag. In another embodiment, the jaws 31 a speed opposite to the direction of movement of the tubular bag material 27 have that with your cheeks 20 engaged when the jaws 31 to the material 27 adjoin.

The advantages of the embodiments described above are that the product is pressed to the bottom of the bag, which is made by increasing the speed of the bag material 27 is changed and it is set in vibration. This increases the speed of making bags.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 4910943 [0002]
• US 5622032 [0002]
• US 4663917 [0002]
• US 6655110 [0002]
• US 7159376 [0002]
• US 7600630 [0002]
• US 7383672 [0002]
• US 4753336 [0002]
• US 7124559 [0002]
• US 7415809 [0002]
• US 7152387 [0002]
• US 7472528 [0002]
• AU 2012258403 [0002]
• AU 20122584 [0002]
• AU 2012258497 [0002]
• AU 2012201494 [0002]
• AU 2012201595 [0002]
• AU 2011360138 [0002]
• EP 2013/052754 [0002]

Claims (13)

A packaging machine receiving tubular bag material and product to make bags with the product, wherein the material moves at a speed in a predetermined direction relative to the machine and the machine includes: a pair of welding jaws, which are rotationally driven together by repeated revolutions in opposite angular directions, the jaws being driven about spaced, generally parallel axes generally transverse to the direction such that each jaw has an angular velocity about a corresponding one of the axes; Jaw carriers to which the jaws are attached and by which they are driven; and a control and motor assembly drivingly coupled to the carriers and therefore the jaws to effect rotation of the carriers, which arrangement is operable to change the angular velocity of the carriers so that the jaws when the jaws are adjacent to each other and engaging with the tubular bag material, have a peripheral speed in the direction that can be changed. Packaging machine according to claim 1, wherein the control and motor arrangement is operated so that it reverses the direction of rotation of the carrier and thus the welding jaws, so that the welding jaws move in an opposite angular direction when they abut each other and with the tubular bag material in Intervention come. A combination of a film transport assembly and a packaging machine receiving tubular bag material from the film transport assembly; the film transport assembly including a plurality of rollers, one of which is a drive disk, and an endless belt running around and driven by the rollers to form a belt drive section which is integral with the tubular bag material engages to move the tubular bag material in a predetermined direction for delivery to the packaging machine on the transport assembly, the packaging machine contains: a pair of welding jaws which are rotatably driven together by repeated revolutions in opposite angular directions, the jaws being driven about spaced, generally parallel axes which are generally transverse to the direction so that they each have an angular velocity and the welding jaws engaging the tubular bag material to transversely weld the tubular bag material and to produce bags having a product; and where Motors are provided which are operatively connected to the film transport assembly and the packaging machine to effect operation of the belt and the welding jaws, and the combination further includes a controller operatively connected to the motors to function thereof; and the controller may be operated such that the motors drive the band and the jaws so that the jaws, when adjacent and engaged with the tubular bag material, have a peripheral speed that is lower than the speed of the band of the sheets -Transportanordnung. The combination of claim 3, wherein the motors include servomotors, at least one servomotor drives the driven roller, at least one servomotor drives the welding jaws, the controller is a computer programmed to operate the servomotors so that the belt engages the tubular bag material given speed, and the servomotor, which drives the welding jaws, operated so that the welding jaws may have a peripheral speed which is lower than the predetermined speed. A combination according to claim 4 or 5, wherein the peripheral speed may have a direction opposite to the predetermined direction. A combination as claimed in claim 3, 4 or 5, wherein the belt has a transport surface which frictionally engages the material, the belt moves along a predetermined path including a generally linear first path section at which the transport surface engages with the material Engaging, and the band has a plurality of passages extending from the surface across the band; a manifold, which is exposed to an air negative pressure and communicates with the passage over at least a portion of the path portion, so that the passages are subjected to negative air pressure and the material is exposed to the air by a difference in air pressure over the material at the first path portion Surface is pressed; wherein the drive pulley is engaged with the band to cause the band to move in a predetermined direction on the path; and a plurality of band engagement means, the band passing between a first one of the engagement means and a second one of the means to form the first path portion, and the means and the disc cooperate and have a second path portion and a third portion Forming path portion, and the second path portion and the third path portion relative to the first path portion in a direction away from the first path portion. The combination of claim 6, wherein the first band comprises a second band, the second band at the first path portion is generally parallel to the first band, and includes a transport surface and a plurality of passages that are transverse to the second band Extending band from the transport surface of the second band, and the passages of the second band are in communication with the manifold, so that the passages of the second band are also exposed to an air negative pressure to press the bag material into engagement with the second band. The combination of claim 7, wherein the second band passes around a second drive roller and a third and a fourth roller. Combination according to claim 8, wherein the second drive pulley has a radius, the third and the fourth roller each have a radius and the radius of the second drive pulley is greater than the radius of the third and the fourth tension pulley. A combination according to any one of claims 6 to 9, wherein the first roller is located approximately vertically above the second roller. A combination according to any one of claims 6 to 10, wherein the second path portion extends between the second tension roller and the drive pulley of the first band and the second path portion is generally horizontal. A combination according to any one of claims 3 to 11, further including a format set; the format set including a forming shoulder consisting of plate material forming a cavity and a bottom edge portion of the format set, the forming shoulder having an outer surface receiving strip-shaped bag material for forming the strip-like bag material into tubular bag material that is of the format set in a predetermined manner Direction is moved; and where the rollers include an upper roller and a lower roller, the upper roller projecting at least partially higher than the lower edge section. A combination according to claim 12, wherein the upper roller extends into the cavity.

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